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Programming Articles
Page 208 of 2544
Can we declare an interface with in another interface in java?
An interface in Java is a specification of method prototypes. Whenever you need to guide the programmer or, make a contract specifying how the methods and fields of a type should be you can define an interface. To create an object of this type you need to implement this interface, provide body for all the abstract methods of the interface and obtain the object of the implementing class. Nested Interfaces Java allows declaring interfaces within another interface, these are known as nested interfaces. While implementing you need to refer to the nested interface as outerInterface.nestedInterface. Example In the following Java example, we have an interface with ...
Read MoreHow can we implement a timer thread in Java?
The Timer class schedules a task to run at a given time once or repeatedly. It can also run in the background as a daemon thread. To associate Timer with a daemon thread, there is a constructor with a boolean value. The Timer schedules a task with fixed delay as well as a fixed rate. In a fixed delay, if any execution is delayed by System GC, the other execution will also be delayed and every execution is delayed corresponding to previous execution. In a fixed rate, if any execution is delayed by System GC then 2-3 execution happens consecutively to ...
Read MoreWhat is the importance of a StringWriter in Java?
The StringWriter class is s subclass of Writer class and it writes the String to an output stream. To write a string, this character stream collects the string into a string buffer and then constructed a string. The buffer of StringWriter automatically grows according to data. The important methods of StringWriter class are write(), append(), getBuffer(), flush() and close(). Syntax public class StringWriter extends Writer Example import java.io.*; public class StringWriterTest { public static void main(String args[]) { String str = "Welcome to Tutorials Point"; try { ...
Read MoreWhat is the importance of Runtime class in Java?
The java.lang.Runtime class is a subclass of Object class, can provide access to various information about the environment in which a program is running. The Java run-time environment creates a single instance of this class that is associated with a program. The Runtime class does not have any public constructors, so a program cannot create its own instances of the class. A program must call the getRuntime() method to get a reference to the current Runtime object. The important methods of Runtime class are addShutdownHook(), exec(), exit(), freeMemory(), gc(), halt() and load(). Syntax public class Runtime extends Object Example public class RuntimeTest { ...
Read MoreWhat are the steps to read static members in a Java class?
A static variable gets created at the time of class loading even before the execution of a static block and the purpose of the static block is to assign value to the static variables. A static variable stores a value that is shared between all instances of the class it is defined in and a static block is a section of code that gets executed when class is first loaded. If we want any logic that needs to be executed at the time of class loading that logic needs to place inside the static block so that it will be executed ...
Read MoreWhy an interface cannot implement another interface in Java?
An interface cannot implement another interface in Java. An interface in Java is essentially a special kind of class. Like classes, the interface contains methods and variables. Unlike classes, interfaces are always completely abstract. An interface is defined just like a class except for the keyword interface in place of a class, the variables are declared in an interface are static and final and the methods are defined in an interface are public abstract methods. An interface can extend any number of interfaces but one interface cannot implement another interface, because if any interface is implemented then its methods must be defined and ...
Read MoreCan we define an abstract class with no abstract methods in Java?
Yes, we can declare an abstract class with no abstract methods in Java. An abstract class means that hiding the implementation and showing the function definition to the user. An abstract class having both abstract methods and non-abstract methods. For an abstract class, we are not able to create an object directly. But Indirectly we can create an object using the subclass object. A Java abstract class can have instance methods that implement a default behavior. An abstract class can extend only one class or one abstract class at a time. Declaring a class as abstract with no abstract methods means that we don't allow it ...
Read MoreCan we have a try block without a catch block in Java?
Yes, It is possible to have a try block without a catch block by using a final block. As we know, a final block will always execute even there is an exception occurred in a try block, except System.exit() it will execute always. Example 1 public class TryBlockWithoutCatch { public static void main(String[] args) { try { System.out.println("Try Block"); } finally { System.out.println("Finally Block"); } } } Output Try Block Finally Block A ...
Read MoreProducer-Consumer Problem in C
In concurrent programming, concurrency represents a pivotal concept necessary to comprehend fully how such systems operate. Among the various challenges encountered by practitioners working with these systems stands out the producer-consumer problem - one of the most renowned synchronization issues. In this text, our objective consists of analyzing this topic and highlighting its significance for concurrent computing while also examining possible solutions rooted within C. Introduction In concurrent systems, multiple threads or processes may access shared resources simultaneously. The producer-consumer problem involves two entities: producers that generate data or tasks, and consumers that process or consume the generated data. The ...
Read MoreVariables in MATLAB – Definition, Characteristics, and Types
MATLAB is a high-level programming language that supports different kinds of fundamental elements. In MATLAB, there is a fundamental element called variable which is used to store data. A variable has a unique name referred to as identifier. A value is stored in the variable that can be utilized through the variable name. In this article, we will study about basics of variables and their characteristics. Also, we will explore different types of variables and their declaration with the help of examples. What is a Variable in MATLAB? In MATLAB, a variable is one of the programming elements that is used to ...
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